In the player sets in which I participate, no one at PSA ever assigned the weighting, I did. If you are the person to create the original composite for a set, which I've done many times, you also submit what the weightings for each card would be.
I agree with the above posters that its supposed to be based on price in ungraded NM condition, but some of the "tone" above made it out like PSA was coming up with the weightings, which is untrue. Also, after the original composite is put together, if YOU are the person who adds a subsequent card to the composite, you submit the weighting for that card as well.
Its a user-driven weighting system.
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